/**
 * Copyright 1996 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 *
 * Note, this is a very old runtime library that I have evolved since 1996. I rarely use it
 * now because the Apache Commons project has made it obsolete.
 */
package self.awt;

import java.util.*;

final public class PainterManager {
  static private HashMap ownerRegistry = new HashMap();
  
  static public void registerOwner( Object owner ) {
    if ( !ownerRegistry.containsKey(owner) ) 
      ownerRegistry.put( owner, new ArrayList() );
  }
  
  static public void unregisterOwner( Object owner ) {
    if ( ownerRegistry.containsKey(owner) ) {
      List painters = (List) ownerRegistry.get( owner );
      painters.clear();
      ownerRegistry.remove( owner );
    }
  }
  
  static public Object getPainterForOwner( Object owner, Class paintClass ) {
    List painters = (List) ownerRegistry.get( owner );
    int max = painters.size();
    for ( int cntr = 0; cntr < max; cntr++ ) {
      Object curr = painters.get( cntr );
      if ( paintClass == curr.getClass() )
        return curr;
    }
    Object newPainter;
    try {
      newPainter = paintClass.newInstance();
    } catch ( Exception err ) {
      throw new IllegalArgumentException( err.getMessage() );
    }
    painters.add( newPainter );
    return newPainter;
  }
}